Now, I am in the market to replace my stock 160GB HDD in my MB, as I want a bigger hard drive in my PS3 and was thinking I could put the MB one in there, and buy a larger one for the MB. I am debating between a 320GB 7200rpm and a 500gbrpm drive. I currently have this external drive: http://www.amazon.com/Seagate-ST302504FDA1E1-RK-FreeAgent-Desktop-External/dp/B000NDBRJC I HATE it. It takes a super long time to start up(close to 3-4 minutes) and then opening up videos takes a good 2-3 seconds. But, I have a 5400rpm drive inside the MacBook and was wondering if 7200rpm with 16mb cache would really make a significant difference in day-to-day use. What would you go for?